28555767493 has 16 divisors (see below), whose sum is σ = 33202673280. Its totient is φ = 24270912000.

The previous prime is 28555767479. The next prime is 28555767517. The reversal of 28555767493 is 39476755582.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28555767493 is a prime.

It is a super-2 number, since 2×28555767493² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28555767293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477408 + ... + 533881.

It is an arithmetic number, because the mean of its divisors is an integer number (2075167080).

Almost surely, 2^28555767493 is an apocalyptic number.

It is an amenable number.

28555767493 is a deficient number, since it is larger than the sum of its proper divisors (4646905787).

28555767493 is a wasteful number, since it uses less digits than its factorization.

28555767493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011468.

The product of its digits is 63504000, while the sum is 61.

The spelling of 28555767493 in words is "twenty-eight billion, five hundred fifty-five million, seven hundred sixty-seven thousand, four hundred ninety-three".